CN213225682U

CN213225682U - Grinder fixing device

Info

Publication number: CN213225682U
Application number: CN202021528637.5U
Authority: CN
Inventors: 代付兵; 陈勇; 梅增胜; 颜燚吟
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-05-18
Anticipated expiration: 2030-07-28

Abstract

The utility model relates to a grind quick-witted fixing device. The grinder fixing device comprises a positioning plate and a first connecting structure. The positioning plate is provided with a second connecting structure, an indicating structure and a sliding groove. When the grinding machine is fixed, whether the positioning plate is centered along the extending direction of the scale mark relative to the flange is judged according to the corresponding scale of the intersection of the positioning plate and the outline of the sealing surface of the flange, so that the positioning plate can be rapidly moved to the centered position. And then the first connecting structure is respectively matched with the connecting hole of the flange and the sliding groove, so that the positioning plate is fixedly connected with the flange. And finally, fixing the grinding machine on the positioning plate through a second connecting structure, so that the grinding machine is fixedly connected with the flange. Because the position of the positioning plate along the extending direction of the scale marks is adjustable, the positioning plate can be centered by adjusting the position of the positioning plate along the extending direction of the scale marks for flanges of valve bodies with different calibers, and the grinding machine fixing device can be suitable for the flanges of the valve bodies with different calibers.

Description

Grinder fixing device

Technical Field

The utility model relates to a valve overhauls instrument technical field, in particular to grind quick-witted fixing device.

Background

The reliability of the valve is particularly important as an important device for controlling a power plant system, especially in some important nuclear safety systems of a nuclear power plant. After the valve runs for a certain time in the system, the sealing surface of the valve has the defects of scratches and the like in different degrees due to the action of a system medium and friction in the opening and closing action process of the valve, so that the sealing of the valve fails. In the process of nuclear power unit refueling overhaul, valves which may have defects need to be disassembled for overhaul, and aiming at the defects of pitting, scratching and the like of the sealing surface which has defects, a commonly used processing scheme at the present stage is to grind the sealing surface of the valve. When the grinder is used on site, the foundation slab needs to be fixed on the valve body flange through a universal fixing device.

Common types of fastening devices include bow tensioners, fastening straps, and fastening clips. The fixing mode of the bow-shaped tensioner can only be used under the condition that two end faces of the flange face of the valve body are planes, and the condition that the lower end face of the flange face of the valve body of the on-site valve is designed into an inclined plane with an inclination angle is not considered. The fastening belt fixing mode can only be used for the condition that the side of valve body flange is broad, and when the side width of valve body flange was narrower, the fastening belt also can't obtain sufficient area of contact to can't reach the fastening effect of requirement, restrict on-the-spot maintenance work.

During the fixing process by using the bow-shaped tensioner or the fastening belt, due to the lack of positioning reference, workers are completely relied on to position the bottom plate by simple measurement and visual observation during the field installation process. The positioning mode can not well ensure that the position of the base plate is centered and the front edge plane of the pressure control seat arranged on the base plate is parallel to the sealing surface, the grinding quality can not be effectively ensured, and workers with insufficient grinding experience can easily cause the condition of grinding deviation of the sealing surface and cause irreversible damage to equipment.

The nuclear power unit has higher requirements on the reliability of equipment, large overhaul period, radiation protection of maintainers and the like. Traditional general type fixing device not only lacks the location benchmark, and is difficult to be used for the valve body flange of different bores to cause maintenance inefficiency.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a grinder fixing device which is convenient for quick positioning and can be applied to valve body flanges with multiple calibers, aiming at the problems that the traditional universal fixing device is not only lack of positioning reference but also difficult to be used for valve body flanges with different calibers.

The embodiment of the application provides a grinder fixing device. The grinder fixing device is used for being fixedly connected with the flange of the valve body. The grinder fixing device comprises a positioning plate and a first connecting structure.

The positioning plate is provided with:

the second connecting structure is used for fixedly connecting the grinding machine with the positioning plate;

the indicating structure is provided with scale marks used for indicating the relative position of the positioning plate and the flange; and

the extending direction of the sliding groove is parallel to the extending direction of the scale marks, and the first connecting structure is respectively used for being matched with the connecting holes of the sliding groove and the flange, so that the positioning plate is fixedly connected with the flange; the positioning plate can adjust the relative position with the first connecting structure along the extending direction of the sliding groove.

When the grinding machine fixing device is used for fixing a grinding machine, the positioning plate is firstly placed on the sealing surface of the flange of the valve body. Through the extension direction removal locating plate along the spout to can adjust the relative position of first connection structure and locating plate along the extension direction of spout, can adjust the relative position of locating plate and first connection structure along the extension direction of scale mark. Whether the positioning plate is centered along the extending direction of the scale marks relative to the flange is judged according to the scales corresponding to the intersecting positions of the profiles of the sealing surfaces of the positioning plate and the flange, so that the positioning plate can be rapidly moved to the centered position along the extending direction of the scale marks. And then the first connecting structure is respectively matched with the connecting hole of the flange and the sliding groove, so that the positioning plate is fixedly connected with the flange. And finally, fixing the grinding machine on the positioning plate through a second connecting structure, so that the grinding machine is fixedly connected with the flange of the valve body. Because the position of the locating plate along the extending direction of the scale marks is adjustable, the locating plate can be centered by adjusting the position of the locating plate along the extending direction of the scale marks for flanges of valve bodies with different calibers, and the grinding machine fixing device can be suitable for the flanges of the valve bodies with different calibers.

In an embodiment, the indication structure is a graduated scale fixedly connected with the positioning plate or a graduated line directly arranged on the positioning plate.

In an embodiment, the graduation lines include a first graduation line and a second graduation line, and the first graduation line and the second graduation line are axisymmetrically distributed on two sides of the second connection structure.

In one embodiment, the graduation marks are provided on the surface of the positioning plate for being parallel to the sealing surface of the flange, or

The scale marks are arranged on the side surface of the positioning plate, and the side surface of the positioning plate is used for abutting against the sealing surface of the flange.

In an embodiment, the second connecting structure is a plurality of positioning holes, and the positioning holes are arranged in at least three rows along a direction perpendicular to the extending direction of the sliding chute; and/or the positioning hole is a threaded hole.

In an embodiment, the first connecting structure is a threaded connecting piece, and the threaded connecting piece is respectively matched with the connecting holes of the chute and the flange, so that the positioning plate is fixedly connected with the flange.

In an embodiment, the first connecting structure includes at least two different structures of threaded connecting pieces, and the different structures of threaded connecting pieces are respectively used for adapting to different types of connecting holes of the flange.

In an embodiment, the first connection structure comprises a first threaded connection; the first threaded connection includes:

the first section is used for being matched with the connecting hole of the flange, the first section extends out to one side back to the sealing surface of the flange, and the extending part of the first section extending out to one side back to the sealing surface of the flange is provided with external threads; and

the second section, with first section fixed connection, the second section with the spout cooperatees, and stretch out to the locating plate back of the one side of first section, the second section stretches out to the protruding portion of the locating plate back of the one side of first section has the external screw thread.

In an embodiment, the first connection structure comprises a second threaded connection; the second threaded connection includes:

a first section having external threads, the first section being adapted to be threadedly engaged with the attachment bore of the flange;

In one embodiment, the second section comprises a guiding section, the guiding section is positioned in the sliding groove, and the guiding section is matched with the sliding groove; and/or one end of the second section, which faces away from the first section, is provided with a boss, and the boss is a regular quadrangular prism or a regular hexagonal prism.

Drawings

FIG. 1 is a schematic view of an embodiment of a grinder fixture in connection with a flange of a valve body;

FIG. 2 is a sectional view showing a connection relationship between the first threaded connector and the flange of FIG. 1;

FIG. 3 is a schematic view of the first threaded connection of FIG. 2;

fig. 4 is a sectional view showing a connection relationship between a second threaded connection member and a flange in another embodiment.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, the present application provides a grinder fixing device 100. The grinder fixture 100 is adapted to be fixedly coupled to the flange 11 of the valve body 10. The grinder fixing device 100 includes a positioning plate 110 and a first coupling structure 120. The positioning plate 110 is provided with a second connecting structure, an indicating structure 130 and a sliding slot 101.

The second coupling structure is used to fixedly couple the grinder (not shown) to the positioning plate 110.

Specifically, in the present embodiment, the second connecting structure is a positioning hole 102. The locating hole 102 may be a threaded hole. The grinding machine can be fixedly coupled to the positioning plate 110 by means of bolts or the like engaging with the grinding machine and the positioning holes 102, respectively.

The indicating structure 130 has graduation marks. The graduation marks are used for indicating the relative position of the positioning plate 110 and the flange 11.

Specifically, the indication structure 130 may be a graduation mark directly engraved on the positioning plate 110. The indicating structure 130 may also be a scale having scale lines thereon. The scale may be fixedly connected to the positioning plate 110 by other means such as bonding or welding.

As shown in fig. 1, the positioning plate 110 is placed on the sealing surface of the flange 11 of the valve body 10. The positioning plate 110 intersects the contour of the sealing surface of the flange 11 in the extending direction of the graduation marks. Whether the positioning plate 110 is centered with respect to the flange 11 in the extending direction of the graduation marks may be judged by the graduation corresponding to the intersection of the positioning plate 110 and the contour of the sealing surface of the flange 11.

The extension direction of the slide groove 101 is parallel to the extension direction of the scale lines. The first coupling structure 120 is engaged with the coupling holes 11a of the chute 101 and the flange 11, respectively, so that the positioning plate 110 is fixedly coupled with the flange 11. The positioning plate 110 can adjust a relative position with the first coupling structure 120 in an extending direction of the chute 101.

Specifically, in the present embodiment, the first connection structure 120 may be a threaded connection. The screw coupling members are respectively located in the coupling holes 11a of the slide groove 101 and the flange 11. When the position of the positioning plate 110 needs to be adjusted, the threaded connecting member is in a loose state with the positioning plate 110. By moving the positioning plate 110 along the extending direction of the sliding chute 101, the threaded connecting member and the positioning plate 110 move relatively in the sliding chute 101 along the extending direction of the sliding chute 101, and the relative position of the positioning plate 110 and the threaded connecting member along the extending direction of the sliding chute 101 can be adjusted.

After the relative position of the positioning plate 110 and the threaded connecting member along the extending direction of the sliding chute 101 is adjusted, the threaded connecting member is respectively matched with the connecting holes 11a of the sliding chute 101 and the flange 11, so that the positioning plate 110 is fixedly connected with the flange 11.

Since the extending direction of the sliding chute 101 is parallel to the extending direction of the graduation marks, that is, the positioning plate 110 can adjust the relative position with the first connecting structure 120 along the extending direction of the graduation marks.

Specifically, in the present embodiment, the first connection structure 120 is a threaded connection. When the indication structure 130 is disposed on the surface of the positioning plate 110 parallel to the sealing surface of the flange 11, the scale mark is very close to the threaded connector or adjacent to the threaded connector, so that whether the positioning plate 110 is centered along the extending direction of the scale mark relative to the flange 11 can also be determined by the scale corresponding to the position of the threaded connector.

When the grinder fixing apparatus 100 is used to fix a grinder, the positioning plate 110 is first placed on the sealing surface of the flange 11 of the valve body 10. By moving the positioning plate 110 along the extending direction of the sliding chute 101, the relative position of the first connecting structure 120 and the positioning plate 110, i.e. the relative position of the positioning plate 110 and the first connecting structure 120, can be adjusted along the extending direction of the graduation lines along the extending direction of the sliding chute 101. Whether the positioning plate 110 is centered with respect to the flange 11 in the extending direction of the graduation marks is judged according to the graduation corresponding to the intersection of the positioning plate 110 and the contour of the sealing surface of the flange 11, so that the positioning plate 110 can be quickly moved to the centered position in the extending direction of the graduation marks. The first connecting structure 120 is engaged with the connecting hole 11a of the flange 11 and the sliding groove 101, respectively, so that the positioning plate 110 is fixedly connected with the flange 11. Finally, the grinder is fixed to the positioning plate 110 by a second coupling structure, so that the grinder is fixedly coupled to the flange of the valve body 10.

Because the position of the positioning plate 110 along the extending direction of the scale marks is adjustable, for the flanges 11 of the valve bodies 10 with different calibers, the positioning plate 110 can be centered by adjusting the position of the positioning plate 110 along the extending direction of the scale marks, and the grinding machine fixing device 100 can be suitable for the flanges 11 of the valve bodies 10 with different calibers.

In one embodiment, the number of the positioning holes 102 is plural. The plurality of positioning holes 102 are arranged in at least three rows in a direction perpendicular to the extending direction of the chute 101.

Specifically, as shown in fig. 1, in the present embodiment, the number of the positioning holes 102 is 8 and is arranged in two rows. The 8 positioning holes 102 are arranged in four rows in a direction perpendicular to the extending direction of the slide groove 101.

When the grinder is fixed to the positioning plate 110, the grinder is fixed to the positioning plate 110 through any two adjacent rows of positioning holes 102. Since the plurality of positioning holes 102 are arranged in at least three rows in a direction perpendicular to the extending direction of the chute 101, the position of the grinding machine can be conveniently adjusted in a direction perpendicular to the extending direction of the chute 101 by selecting any two adjacent rows of the positioning holes 102 from the at least three rows of positioning holes 102 to be matched with the grinding machine.

For flanges 11 of different calibers, the distance from the grinder to the center of the flange 11 is different, so that the distance from the grinder to the center of the flange 11 can be selectively set by selecting the pilot holes 102 of any two adjacent rows from among the at least three rows of pilot holes 102 to cooperate with the grinder, thereby facilitating the grinder fixing device 100 to be adapted to the flanges 11 of valve bodies 10 of different calibers.

Referring to fig. 1, in an embodiment, the graduation marks of the indication structure 130 include a first graduation mark 131 and a second graduation mark 132. The first graduation mark 131 and the second graduation mark 132 are axisymmetrically distributed on both sides of the second connection structure.

Specifically, as shown in fig. 1, the positioning plates 110 intersect the contours of the sealing surfaces of the flanges 11 on both sides of the second coupling structure, respectively. Since the first and second calibration marks 131 and 132 are axisymmetrically distributed on both sides of the second coupling structure, the first calibration mark 131 indicates a scale at the intersection of the positioning plate 110 and one side of the contour of the sealing surface of the flange 11, and the second calibration mark 132 indicates a scale at the intersection of the positioning plate 110 and the other side of the contour of the sealing surface of the flange 11.

Since the first and second graduation marks 131 and 132 are axisymmetrically distributed on both sides of the second connection structure, the second connection structure is centered with respect to the first and second graduation marks 131 and 132. When the second coupling structure is centered with respect to the flange 11 in the extending direction of the graduation marks, the grinder may be centered when it is fixed to the positioning plate 110 by the second coupling structure. Therefore, when the second connection structure is centered with respect to the flange 11 in the extension direction of the graduation marks, i.e. the positioning plate 110 is centered with respect to the flange 11 in the extension direction of the graduation marks.

When the scale at the intersection of the positioning plate 110 and one side of the contour of the sealing surface of the flange 11, which is indicated by the first scale mark 131, is the same as the scale at the intersection of the positioning plate 110 and the other side of the contour of the sealing surface of the flange 11, which is indicated by the second scale mark 132, it can be determined that the second coupling structure is centered with respect to the flange 11 along the extending direction of the scale marks, that is, the positioning plate 110 is centered with respect to the flange 11 along the extending direction of the scale marks, so that the position of the positioning plate 110 can be quickly adjusted according to the scales indicated by the first scale mark 131 and the second scale mark 132, so that the positioning plate 110 is.

Specifically, in the present embodiment, the first connection structure 120 is a threaded connection. Whether the positioning plate 110 is centered with respect to the flange 11 in the extending direction of the graduation lines can also be judged by the graduation corresponding to the position of the screw connection. As shown in FIG. 1, the flange 11 is connected to the positioning plate 110 by two threaded connectors. One runner 101 for each threaded connection. The first graduation marks 131 may indicate the graduation of one of the two threaded connections and the second graduation marks 131 may indicate the graduation of the other of the two threaded connections. When the scale of one of the threaded connectors indicated by the first scale marks 131 is the same as the scale of the other threaded connector indicated by the second scale marks 132, the positioning plate 110 is centered with respect to the flange 11 in the extending direction of the scale marks.

Referring to fig. 1, in an embodiment, the indication structure 130 is used to be disposed on a surface of the positioning plate 110 parallel to the sealing surface of the flange 11, so as to facilitate the location of the indication structure 130.

In other embodiments, the indication structure 130 may also be disposed on the side 111 of the positioning plate 110. The side 111 of the positioning plate 110 may be perpendicular or oblique to the sealing surface of the flange 11. When the positioning plate 110 is placed on the sealing surface of the flange 11, the side 111 of the positioning plate 110 abuts against the sealing surface of the flange 11, so that the graduation marks of the indicating structure 130 can intersect with the sealing surface of the flange 11, thereby facilitating accurate and rapid reading of the graduation marks indicated by the graduation marks at the intersection of the positioning plate 110 and the contour of the sealing surface of the flange 11.

In one embodiment, the first connecting structure includes at least two different threaded connecting members, and the different threaded connecting members are respectively adapted to different types of connecting holes 11a of the flange 11.

The attachment holes 11a of the flange 11 are of many different types, and may be, for example, through holes, threaded holes, etc.

In this embodiment, the first connection structure includes two different configurations of threaded connections. Each screw-threaded connector is adapted to different types of attachment holes 11a so that different screw-threaded connectors can be adapted to different types of attachment holes 11a, thereby making it possible for the grinder fixing device 100 to be adapted to fix a grinder to a flange 11 corresponding to different types of attachment holes 11 a.

In other embodiments, the first coupling structure may further include three, four, etc. more kinds of screw coupling members, so that the grinder fixing device 100 may be applicable to three, four, etc. more kinds of coupling holes 11 a.

Referring to fig. 3, in an embodiment, the first connecting structure 120 includes a first threaded connector 121. Referring to fig. 2, the connection hole 11a of the flange 11 is a through hole. The first screw thread connector 121 is suitable for the case where the coupling hole 11a of the flange 11 is a through hole. The first threaded connection 121 includes a first section 1211 and a second section 1212. The second segment 1212 is fixedly connected to the first segment 1211.

The first section 1211 is adapted to be fitted into the coupling hole 11a of the flange 11 and protrudes to a side facing away from the sealing surface of the flange 11, and a protruding portion of the first section 1211 protruding to a side facing away from the sealing surface of the flange 11 has an external thread.

Specifically, the first section 1211 is located within the coupling hole 11a of the flange 11 and is fitted into the coupling hole 11a of the flange 11. The extension of the first section 1211 to the side facing away from the sealing surface of the flange 11 is externally threaded so that the nut 123 can be fitted with the external thread of the first section 1211 and so that the end face of the nut 123 abuts against the surface of the flange 11. The nut 123 may be part of the first connection structure 120 or another separately configured nut.

The second segment 1212 is engaged with the sliding slot 101 and extends to a side of the positioning plate 110 opposite to the first segment 1211, and a protruding portion of the second segment 1212 extending to the side of the positioning plate 110 opposite to the first segment 1211 is provided with an external thread.

Specifically, the second segment 1212 is located within the chute 101. The extension of the second segment 1212 to the side of the positioning plate 110 facing away from the first segment 1211 is externally threaded such that the nut 124 may mate with the external threads of the second segment 1212 and such that the end face of the nut 124 abuts against the surface of the positioning plate 110. The nut 124 may be part of the first connection structure 120 or a separately configured nut.

Since the protruding portion of the first section 1211 protruding to the side facing away from the sealing surface of the flange 11 is engaged with the nut 123 and the end surface of the nut 123 is tightly attached to the surface of the flange 11, the protruding portion of the second section 1212 protruding to the side of the positioning plate 110 facing away from the first section 1211 is engaged with the nut 124 and the end surface of the nut 124 is tightly attached to the surface of the positioning plate 110, so that the positioning plate 110 and the flange 11 are clamped between the nut 123 and the nut 124, and the positioning plate 110 is tightly connected to the flange 11.

Referring to fig. 2 and 3, in an embodiment, the second segment 1212 includes a guiding segment 1213, the guiding segment 1213 is located in the sliding slot 101, and the guiding segment 1213 is adapted to the sliding slot 101.

Specifically, the outer peripheral surface of the guide section 1213 is fitted to the inner wall of the sliding slot 101, so that when the positioning plate 110 is moved along the extending direction of the sliding slot 101, the positioning plate 110 is not easily shifted along the radial direction of the guide section 1213, which is beneficial to accurately positioning the positioning plate 110.

Referring to fig. 2 and 3, in an embodiment, an end of the second segment 1212 facing away from the first segment 1211 is provided with a boss 1214, and the boss 1214 is a regular quadrangular prism or a regular hexagonal prism, so that a wrench can be conveniently engaged with the boss 1214 to rotate the first connecting structure 120, so that the first connecting structure 120 is engaged with the sliding slot 101 and the connecting hole 11 a.

Referring to fig. 4, in another embodiment, the first connecting structure 120 includes a second threaded connector. The second threaded connection includes a first segment 2211 and a second segment 2212. Second segment 2212 is fixedly connected to first segment 2211. The second threaded connection has the same basic structure as the first threaded connection 121 and will not be described in detail. The following focuses on the differences between the second threaded connection and the first threaded connection 121.

As shown in fig. 4, the second screw coupling member is adapted to the coupling hole of the flange 21. The attachment holes of the flange 21 are threaded holes. And the surface 211 of the flange 21 opposite the sealing surface is beveled.

The first segment 2211 is externally threaded. The first segment 2211 is adapted to be threadedly engaged with the attachment hole 11a of the flange 21.

Specifically, the first segment 2211 is located in the connecting hole of the flange 21, and the thread of the first segment 2211 is screwed with the thread of the connecting hole of the flange 21, so that the second threaded connector is fixedly connected with the flange 21.

The second segment 2212 is matched with the sliding groove and extends out to the side, back to the first segment 2211, of the positioning plate 210, and the extending part, extending out to the side, back to the first segment 2211, of the second segment 2212 is provided with external threads, so that the nut 224 is matched with the external threads of the second segment 2212, and the end face of the nut 224 is enabled to be tightly attached to the surface of the positioning plate. The nut 224 may be part of the first attachment structure or a separately configured nut.

Since the first segment 2211 is in threaded fit with the connecting hole of the flange 21, the protruding portion of the second segment 2212 protruding to the side of the positioning plate facing away from the first segment 2211 is in fit with the nut 224, and the end face of the nut 224 is tightly attached to the surface of the positioning plate, so that the positioning plate is clamped between the nut 224 and the flange 21, and the positioning plate is tightly connected with the flange 21. Therefore, the second screw connection is suitable for the case where the connection hole of the flange 21 is a screw hole, and for the case where the surface 211 of the flange 21 opposite to the sealing surface is an inclined surface.

In an embodiment, the first coupling structure 120 may include both the first and second threaded

connectors

121 and 121, so that the grinder fixing device 100 may be used at least in the case where the coupling hole of the flange is a threaded hole or a through hole.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A grinding machine fixing device is used for being fixedly connected with a flange of a valve body and is characterized by comprising a positioning plate and a first connecting structure;

the positioning plate is provided with:

2. A mill fixing apparatus as claimed in claim 1 wherein the indicating means is a scale fixedly attached to the locating plate or a scale mark provided directly on the locating plate.

3. A grinding mill mounting apparatus according to claim 2, wherein the graduations include first and second graduations, the first and second graduations being axisymmetrically distributed on opposite sides of the second connection formation.

4. A grinding mill holding apparatus as claimed in claim 2,

the scale marks are arranged on the surface of the positioning plate parallel to the sealing surface of the flange, or

5. A grinding mill fixing apparatus according to claim 1, wherein the second attachment formation is a plurality of positioning holes arranged in at least three rows in a direction perpendicular to the direction of extension of the chute; and/or the positioning hole is a threaded hole.

6. A grinder attachment apparatus as claimed in claim 1, wherein the first attachment formation is a threaded connection which cooperates with the attachment holes of the runner and the flange respectively, such that the retaining plate is fixedly attached to the flange.

7. A mill fixing device as claimed in claim 6, characterised in that the first attachment structure includes at least two different configurations of threaded connectors for adapting to different types of attachment holes of the flange respectively.

8. The grinder securing device according to claim 6, characterised in that the first connecting structure comprises a first threaded connection; the first threaded connection includes:

9. The grinder securing device according to claim 6, characterised in that the first connecting structure comprises a second threaded connecting piece; the second threaded connection includes:

10. A mill fixing device as claimed in claim 8 or 9, in which the second section comprises a guide section, the guide section being located within the chute and the guide section fitting into the chute; and/or one end of the second section, which faces away from the first section, is provided with a boss, and the boss is a regular quadrangular prism or a regular hexagonal prism.